linux-kernel - Re: [PATCH v4 1/3] dt-bindings: soc: sophgo: add TOP syscon for CV18XX/SG200X series SoC

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Message-ID: <20251027151352.GA765054-robh@kernel.org>
Date: Mon, 27 Oct 2025 10:13:52 -0500
From: Rob Herring <robh@...nel.org>
To: Conor Dooley <conor@...nel.org>
Cc: Longbin Li <looong.bin@...il.com>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Inochi Amaoto <inochiama@...il.com>, Paul Walmsley <pjw@...nel.org>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Alexander Sverdlin <alexander.sverdlin@...il.com>,
	Yu Yuan <yu.yuan@...u.edu.cn>, Ze Huang <huangze@...t.edu.cn>,
	devicetree@...r.kernel.org, sophgo@...ts.linux.dev,
	linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 1/3] dt-bindings: soc: sophgo: add TOP syscon for
 CV18XX/SG200X series SoC

On Sun, Oct 26, 2025 at 09:44:12PM +0000, Conor Dooley wrote:
> Rob, Longbin,
> 
> On Sun, Oct 26, 2025 at 05:47:32PM +0800, Longbin Li wrote:
> > On Sat, Oct 25, 2025 at 01:44:00PM +0100, Conor Dooley wrote:
> > > On Sat, Oct 25, 2025 at 10:27:13AM +0800, Longbin Li wrote:
> > > > On Fri, Oct 24, 2025 at 05:46:03PM +0100, Conor Dooley wrote:
> > > > 
> > > > > > ...
> > > > > > +
> > > > > > +properties:
> > > > > > +  compatible:
> > > > > > +    oneOf:
> > > > > > +      - items:
> > > > > > +          - const: sophgo,cv1800b-top-syscon
> > > > > > +          - const: syscon
> > > > > > +          - const: simple-mfd
> > > > > > +
> > > > > > +  reg:
> > > > > > +    maxItems: 1
> > > > > > +
> > > > > > +  "#address-cells":
> > > > > > +    const: 1
> > > > > > +
> > > > > > +  "#size-cells":
> > > > > > +    const: 1
> > > > > > +
> > > > > > +  ranges: true
> > > > > 
> > > > > Do you actually use ranges?
> > > > > 
> > 
> > Actually, I do not use it.
> > I added it following Rob's suggestion in
> > https://lore.kernel.org/all/20251015134144.GA3265377-robh@kernel.org/.
> > Should I drop it or not?
> 
> I don't know why he suggested it, if it is not being used. Rob?

Child nodes are memory-mapped, right? MMIO should have 'ranges' all the 
way down. Doesn't matter if Linux (currently) uses it or not.

Rob